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Whether a race, special group ride, training opportunity, or cycling-related community event, the 303 calendar showcases it all.  To have an event posted here please follow this link:  Event Policy Submission & Guidelines.

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January 2018

Yeti Chase 5k & 10k

January 28
Bear Creek Lake Park Lakewood, CO United States + Google Map

Lakewood   This 5k/10k run is brought to you by Racing Underground. Conveniently located on the scenic west side of metro Denver, Bear Creek Lake Park is known for it's diverse bird and waterfowl population as well as stunning views of the foothills. The 5k and 10k races wander it's 2500 acres with a mostly flat 5K course, while the 10k throws in a few rolling hills. The race has sold out weeks before race day every year, and offers…

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Yeti Chase 5k & 10k

January 28 @ 10:00 am - 1:00 pm
Bear Creek Lake Park Lakewood, CO United States + Google Map

Lakewood   Race number two is the popular Yeti Chase 5K & 10K at Bear Creek Lake Park in Lakewood on January 28th. This is the 8th year for the Yeti Chase, and it has sold out well before race day in all previous years. After chasing down the Yeti, runners wander the park's 2,500 acres, known for its diverse bird and waterfowl population as well as stunning views of the foothills.   Event details and registration here   Series…

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February 2018

Ralston Creek Half Marathon & 5k

February 18 @ 9:00 am - 1:00 pm

Arvada   Long Sleeve Half-Zip Tech Shirt if registered before Jan. 19! The series finale comes at the Ralston Creek Half-Marathon & 5K in Arvada on February 18th. The Ralston Creek Half-Marathon has sold-out in all previous years, establishing itself as Colorado's premier winter half marathon. The Ralston Creek 5K Run round's out our 5K series, with a flat and fast course! Both race courses follow a scenic mix of road and bike path through Arvada's beautiful west side. Event…

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Chilly Cheeks Duathlon Series – Race #3

February 24 @ 10:00 am - 12:00 pm
Cherry Creek State Park, 4201 S Parker Rd
Aurora, CO 80014
+ Google Map

Denver   The Duathlon Series The Chilly Cheeks Duathlon Series is composed of 3 events - each with a different format. Each race is comprised of approximately 4 miles of running on paved roads, bike paths, and dirt trails. There will also be approximately 10 miles of paved cycling in each race. Keep in mind, this is a winter event, and although the entire bike course is paved, there may be snow, sand, and/or ice along the route. This website…

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April 2018

Three Creeks Half Marathon

April 22
Cherry Creek State Park, 4201 S Parker Rd
Aurora, CO 80014
+ Google Map

Denver Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a USA Track & Field certified half marathon course that is flat, fast and scenic! Travel on foot through some of the most beautiful parts of Cherry Creek State Park, with a total combined elevation gain of only 291 feet spread out over 13.1 miles as the course follows the banks of Cherry Creek, Windmill Creek, and Cottonwood Creek on a mix of road,…

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May 2018

Barkin’ Dog Duathlon

May 6
Cherry Creek State Park, 4201 S Parker Rd
Aurora, CO 80014
+ Google Map

Denver The Barkin' Dog Duathlon celebrates 20 years as the kickoff race for the summer multisport season! The BarkinÕ Dog is Colorado's largest duathlon, and consistently one of the largest duathlons in the Western United States. The race spent it's first seven years in the small town of Keenesburg, just north and east of Denver, but we outgrew that location and made the move to Cherry Creek State Park in 2006. This race attracts some of the top pro's in…

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July 2018

Evergreen Sprint Triathlon

July 22

Evergreen   Experience the "WOW Factor" on this beautiful foothills course!!! Nothing beats this cool lake swim, spectacular road bike ride, and scenic dirt road & trail run - all just 20 minutes from Denver Evergreen Lake had not seen a triathlon since the early 90's when the Evergreen High Country Triathlon challenged athletes from around the country. We revived the tradition in 2012, and the course received rave reviews. Demand for the fifth edition of the Evergreen Sprint Triathlon…

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September 2018

Littlefoot Triathlon

September 15
Bear Creek Lake Park Lakewood, CO United States + Google Map

Morrison   Enjoy a fun late season tri at beautiful Bear Creek Lake Park in the Lakewood/Morrison area. Set at the base of the foothills, the Littlefoot Triathlon starts off with a 750 meter swim in Soda Lake, with water temps expected to be approximately 70 degrees. Next, a rolling bike 15K bike ride that covers nearly the entire park, offering great views throughout! Finish it up with a scenic 5K run on a bike path that winds through the…

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